Nightmare Fuel: The Mind Wars in the Silver Age. As the name implies, they are fought with far-future weaponry that can deform or obliterate the victim's mind. (Oh, and protecting your head isn't enough, the rays just need to find one unprotected ganglion.) The book doesn't go into a lot of detail about that era, but that might be for the best.
Not So Crazy Anymore: The Fourty-Two Century butter-pie bears a striking resemblance to a Twenty-One Century "lava cake" (a cake with a molten filling, such as melted chocolate or warm ganache). Both are equally delicious.
Truth in Television: A 20th century version of butter-pie does exist, but not in the form that is in the story, being a form of potato and onion pie from Lancashire.